What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm? (b) Rigel, a bluish - white star in Orion, radiates with a peak wavelength of 145 nm. Find the temperature of Rigel’s surface.

If a star has a surface temperature of 5000 K what will the maximum wavelength emitted by the star be?

Gauss's law states that fg.dA= -4RGM. A spherical star of mass M and radius R has a uniform density. By applying Gauss's law to a suitable Gaussian surface, show that the magnitude of g within the star rises linearly with radius r. In practice, a star is likely to have a higher density near its center. By referring to Gauss's law, explain in outline what effect this would have on g at a given radius r. Sketch g as a function of r for the above two situations (for r < R and assuming that in both cases the star has the same total mass M).

A He-Ne laser with wavelength 632.8 nm is fired from a great distance toward a neutron star with mass 4.5 x 1030 kg and radius 12 km. What is the wavelength of light received at the neutron star’s surface?

-According to appendix C: radius of the sun is 7 x 10^8 m